Concord, New Hampshire (CNN) – Greeted with elaborate fanfare and a hallway full of supporters, Mitt Romney filed for his candidacy in New Hampshire Monday, joking that "hopefully this time it will take."

Romney was accompanied by his newest big-name endorsement, former New Hampshire Gov. John Sununu.FULL POST

Las Vegas (CNN) - President Barack Obama visits Las Vegas Monday, part of Western trip that will mix campaigning with presidential business - and an appearance on "The Tonight Show."

A campaign event was scheduled at The Bellagio hotel and casino on Monday afternoon. Obama then will meet with homeowners at a private residence and will deliver remarks, according to an official schedule released by the White House.

CNN: Cain 'flip-flops,' Bachmann says
Republican presidential candidate Michele Bachmann continued to hit rival Herman Cain's conservative credentials Sunday amid a recent dust up over comments he made about abortion. Bachmann said the remarks made earlier this week were further evidence of the businessman's "troubling" policy shifts.